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(No Model.) 2 Sheets-Sheet 1.

P. G. WISELOGEL.

OFFAL DRIER. No. 317,061. Patented May 5, 1885.

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F. G. WISELOGEL.

No Model.)

OFFAL DRIER.

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WITNESSES.

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UNITED STATES PATENT Unmet.

FREDERICK or. WISELOGEL, on INDIANAPOLIS, INDIANA.

OFFAL-DRIER.

SPEGIEKCATION forming part of Letters Patent No. 317,061, dated May 5, 1885.

Application filed May 27, 1884. (No model.)

To all whom it may concern:

Be it known that I, FREDERICK G. WIsn- LOGEL, of the city of Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Offal- Driers, of which the following is a specification.

The principal object of my said invention is to provide an apparatus for drying offal, (principally refuse animal matter,) and converting it into a fertilizer. This object is accomplished by providing a suitable boiler, mounting a tube therein, one end of which is adapted to receive the offal and the other end to discharge it, and providing within said tube a rotating agitator and conveyer which is adapted to keep the offal agitated, and at the same time convey it from the end at which it is received through the tube to the end where it is discharged, and providing a suitable conveyer for conveying said offal to said tube, preferably through the smoke stack, all of which will be hereinafter particularly described.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure 1 is an end elevation of my apparatus, a portion of the smoke-stack and conveyer-casing being broken away to show the -preferablemeans for conveying the offal from the elevator to the tube; Fig. 2, a central 1ongitudinal section of the same, the agitator within the tube being shown in elevation, except for a short distance at one end,,where the outside is broken away to show the con struction of said end; Fig. 3, a detail View showing the discharge end of the tube in longitudinal section on an enlarged scale; and Fig. 4 a detail sectional view on an enlarged scale of the lower part of the pipe which conducts the offal to the tube, and said tube, and their relation to surrounding parts.

In said drawings the portions marked A represent the boiler; 13, the tube within the said boiler; B, the agitator and conveyer within said tube; 0, the smoke-stack; D, a pipe within said smoke-stack; E, a conveyer, and F the upper end of an elevator.

, The boiler A is in the main of an ordinary construction. It is provided with a large tubular opening, which extends longitudinally thereof, in which the tube B is mounted. It is mounted over a furnace in the usual manner, as shown.

The tube B'is of an appropriate size, and extends through the tubular opening in the boiler, each end preferably extending out for a short distance beyond the end of said boiler. The end under the smoke-stack is provided with anopening,b,in its top side,through which the offal is introduced. The other end has an opening, I), in its under side, through which it is discharged. A ventilator, B, on the discharge end of the tube, through which the fumes and steam escape into the inclosure at the end of the boiler, and pass through the flues along with the products of combustion, back to the smoke stack, and thence out into the open air. Said ventilator consists of a short pipe having a roof a short distance above its top end, as shown, which prevents any dirt from entering the tube.

The agitator and conveyer shaft B is preferably hollow, and is journaled in suitable bearings in each end of said tube B. It is provided with a beveled gear-wheel, b, on its outer end, which engages with a similar gearwheel, a, upon a driving-shaft, whereby said shaft 13 is driven. It is provided at intervals throughout its length with radial arms b which are set in or formed upon the hubs B Said hubs are rigidly secured to the shaft, and each is provided with a suitable number of arms, three being shown as the preferable number. Longitudinal spiral ribs B are secured to the ends of these arms, and are shown as being twisted about one-third the way around the shaft from end to end; but, as will be readily understood, the twist may be of a greater or less degree, as desired. There are preferably the same numberof spiral ribs as there are arms upon eachhub; but the number of each is regulated by the desired operation upon the offal, my invention not being limited to any specified number. The shaft, as before stated, is preferably hollow, and each end is filled with astufiing-box, B through which a steam-pipe, b, is inserted, and thus a means is provided for admitting the passage of steam through said shaft, whereby it may be kept hot and the efficiency of the apparatus thus increased.

The smoke-stack O is in main of an ordinary is provided IOC construction, except that from the breeehing up for a considerable distance it is made larger than ordinarily in order to accommodate the vertical pipe D, which is located therein, without interfering with the usual functions of the smoke-stack.

The vertical pipeD is of any length desired,

preferably of a length sufficient to extend through that part of the smoke-stack wherein the heat is of sufficient intensity to be of service in drying the offal as it passes down through said pipe. It ismounted at its lower end upon the end of the horizontal tube B, with which it communicates. Its top end is flared out on the side next to the conveyer, and is' connected to. the under side of the conveyer-easing, thus forming a communication between the two. Said end is held in place by the braces c, which extend from its top out on each side to the sides of the smoke-stack, as shown.- On its inside it is provided-with a series of shelves, d, which extend inwardly a short distance from each side of the pipe, preferably to or a little past the center. They are preferably arranged so that each shelf will be about half-way between thcshelves above and below it on the opposite side of the tube. A vertical shaft, D, bearing scraper-bars d, is mounted in the center of said tube, between the edges of the shelves. Its lower end is journaled in asuitable bearing, d in the lower end of the tube. Said bearing is preferably formed in the center of a straight bar, D which is secured at each end to the sides of the tube, and thus an open space is left of sufficient size to allow the offal to fall through freely. A hub, (1 bearing one of the scraper-bars d, is secured on the shaft D just above this bearing,and serves to support said shaft. Its upper end is journaled in asimilar bearing, as shown, and has a miter gear-wheel, d thereon, which meshes with a like wheel, 6, upon the end of the conveyer-shaft, whereby said shaft D is driven. The scraper-bars d project out from the shaft just above each shelf, and thus as the shaft turns around they operate to knock off what offal may have become lodged upon said shelf down onto the shelves below and finally into the horizontal tube B. The course of the offal down this pipe is thus retarded, and the full benefit of the heat thus secured. The conveyer E is an ordinary spiral conveyer, which takes the offal from the elevator and conveys it into the top of the tube D, as will be readily understood from the drawings. A belt-pulley, E, is mounted on the end of the shaft next the elevator, by which said shaft is driven. The other end of the shaft is journaled in a bearing, 0, on the side of the smoke-stack, and at the end of the conveyer has the miter gear-wheel e, which meshes with the miter gear-wheel (2 upon the top end of the shaft D, and drives said shaft, as before described.

The elevator F is any suitable elevator for the purpose, and forms in itself no part of this invention. It elevates the offal from the floor,

ground, or wherever it may be to the outer end of the conveyer, into which it deposits it.

My invention operates as follows: The apparatus is heated by firing the furnace and getting up steam in the usual manner. The horizontal tube B, which is mounted in the boiler, is thus heated, as will be readily understood, and, a connection being made between the boiler or engine exhaust-pipe and the steam-pipe b in the ends of the hollow shaft B, the steam is carried through said shaft, and it is also thus heated. The products of combustion, passing back through the fines in the boiler into the smoke-stack, and up said smoke-stack around the vertical pipe D, also tend to heat said pipe through which the offal descends, as before described. The offal is first carried into the outer end of the conveyer E in its green state. Said conveyer gradually carries it along toward its other end, where it discharges it into the top of the vertical pipe D. During its passage through said conveyer'the offal is thoroughly worked up and dried to a slight extent. In coming into the vertical pipe the offal first falls upon the top shelf, and is then brushed off by the rotating scrapers (2 onto the next shelf below, which operation is repeated until it reaches the bottom and drops into the tube B. In passing down this tube, which is kept hot by the products of combustion from the furnace, the offal is considerably dried and heated, and is thus introduced into the tube B in a somewhat advanced state, instead of wholly green. The arms I) and spiral ribs B upon the hollow shaft B then operate upon it in said tube, which is kept very hot by the boiler without,and the steam, passing through the hollow shaft, within. Said arms and ribs keep the matter thoroughly stirred, and at the same time work it toward the discharge end of the tube. The ventilator B allows all the products of evaporation to pass off, as before described, and thus, as will be readily understood, the process of drying is carried on with considerable rapidity during the passage of the offal through this tube, from which it is discharged with nearly all the moisture dried out, it being the design to have the apparatus capable of removing about ninety per cent of the liquid substance of the offal in its original state.

As before stated, the principal object of my invention is to dry offal and reduce it to a suitable state to be used as a fertilizer; but, as will be apparent, it is equally capable of drying other substancessuch as grain, feed, and similar articles-when it is desired to do so, though some slight changes may be desirable in adapting it to these uses, and for grain it will probably be desirable to have the tube B revolve instead of the conveyer, and change the conveyer or means of conveying accordingly.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is

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1. Adrying apparatus consisting of aboiler having a longitudinal opening therein, a tube mounted in said opening, said'tube being provided with an opening to receive the substance to be dried at one end and an opening at the other end, atube extending up from said opening into the smoke-stack, through which it is discharged, and a conveyer within said tube for conveying said substance from one end to the other, substantially as set forth.

2. An apparatus for dryingoffal, 8m, consisting of a tube mounted in a longitudinal opening in a boiler and provided with a conveyer for conveying the offal through said tube, the shaft of said conveyer being hollow and provided in each end with steam-pipes, whereby said shaft is kept hot, substantially as described, and for the purposes specified.

3. In an apparatus for drying offal, 8tc., the combination of a boiler having a longitudinal opening therein, a tube having an opening at one end to receive the offal'and at the other end to discharge it mounted therein, an agitator and conveyer mounted in said tube, the shaft of which is made hollow and provided in each end with stuffing-boxes through which steampipes pass, and said steam-pipes, all substantially as set forth.

4. The combination of the boiler A, the tube B therein, the Smokestack C, the vertical pipe D therein, and the agitator and conveyer B in said tube having hubs B mounted on its shaft at intervals throughout its length, said hubs having radial arms projecting therefrom, and said arms having longitudinal spiral ribs B, secured to their outer ends, substantially as described, and for the purposes specified.

5. The combination, with the boiler A, of the tube B, mounted in a longitudinal opening in said boiler, the end of which extends out beyond the end of said boilerand is provided with a ventilator through which the products of evaporation can escape into the fiues of the boiler and pass off with the products of combustion, substantially as set forth.

6. The combination, with the boiler A, of the .tube B, mounted in a longitudinal opening in said boiler and provided with an internal conveyer, the end of said tube being extended out beyond the end of said boiler and provided with a ventilator consisting of a short pipe and a roof above said pipe, substantially as described, and for the purposes specified.

7. The combinationfwith the boiler A, of the tube B, mounted therein and provided with a ventilator, B the agitator and con-' consisting of longitudinal spiral ribs veyer B, mounted on the ends of radial arms extending out from a central shaft, said shaft being hollow and having steam-pipes in each end, substantially as described, and for the purposes specified.

8. The combination, in a drying apparatus, with a tube mounted in a longitudinal open ing in a suitable boiler, of a vertical pipe con nected at its lower end with one end of said longitudinal tube and extended up a short distance through the lower part of the smokestack, and connected at its top end to a suitable conveyer, substantially as described, and for the purposes specified.

9. In a drying apparatus, the combination of the boiler A, the tube-B, mounted longitudinally therein, over one end of said tube B, vertical pipe D, mounted within the lower end of the smokestack andconnected at its lower end to the end of the tube B, and the conveyer E, arranged between an elevator and the top end of the smoke-stack G, constructed vertical pipe D, whereby a means is provided for conveying the substance to be dried from said elevator into the tube B within the boiler, substantially as set forth.

10. The combination, in an apparatus for drying offal, of the tube B,mountedlongitudinally in the boiler A, the vertical pipe D, within the smoke-stack G, the lower end of said vertical pipe being connected to one end of said tube, and said vertical pipe being provided upon its inside with shelves extending inwardly alternately a short distance from opposite sides of said tube, and a vertical shaft, D, journaled in suitable bearings in said vertical pipe and provided with scrapers (1, extending out therefrom just above each shelf, whereby the matter lodged upon said shelves tially as set forth.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this O. BRADFORD, CHAS. L. THURBER.

is scraped off as said shaft revolves, substan- ICO 

